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# A certain novel is available in hardcover and paperback. If

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A certain novel is available in hardcover and paperback. If [#permalink]  19 Dec 2004, 18:23
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20. A certain novel is available in hardcover and paperback. If the store stocks a total of 100 copies of this book, how many are paperbacks?
(1) If 20 hardcover versions of this book were sold, there would be three times as many hardcover versions of the book remaining as paperback versions of the book remaining.
(2) If the hardcover version of the book cost twice as much as the paperback version of the book, the total sales of all the books in stock would yield $90 I know that (1) is sufficient but I do no understand why (2) is insufficient GMAT Club Legend Joined: 15 Dec 2003 Posts: 4309 Followers: 29 Kudos [?]: 235 [0], given: 0 [#permalink] 19 Dec 2004, 18:24 Hi, please post at most 10 questions at a time so as not to flood the forum and to give everyone the time to answer your questions. Thank you in advance. _________________ Best Regards, Paul Manager Joined: 19 Nov 2004 Posts: 59 Followers: 1 Kudos [?]: 3 [0], given: 0 [#permalink] 21 Dec 2004, 07:23 The answer is A I'll explain you why (2) is insufficient let x- the cost of paperback book 2x-hardcover y-paperback books, 100-y-handcover then you have one equation and two unknown xy+2x(100-y)=90 How can you find the solution? Last edited by lovely_baby on 21 Dec 2004, 07:24, edited 1 time in total. [#permalink] 21 Dec 2004, 07:23 Similar topics Replies Last post Similar Topics: 2 A shelf contains hardcover and paperback books, of either fiction or n 3 16 Feb 2015, 05:45 3 A bookshelf holds both paperback and hardcover books. The 3 11 Oct 2013, 16:05 The number of hardcover books at bookstore X is 67.5% of all 1 24 Dec 2010, 05:05 paperback and hardbook ..gmat Q 1 20 Jun 2009, 02:48 Juan bought some paperback books that cost$8 each and some 5 16 May 2006, 23:28
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